细多管CPC线性菲涅耳聚光系统仿真及实验研究

Simulation and Experimental Study of a Thin Multi-Tube Compound Parabolic Condenser Linear Fresnel Spot System

线性菲涅耳聚光发电系统具有迎风面小、土地占有率高等优点,从而受到市场的青睐,但是聚光系统建造的高成本制约着其发展应用。针对上述问题,采用多个细集热管代替一个粗集热管的方式来解决,使复合抛物面聚光器(CPC)的总开口达到1118.79mm,一次反射镜的宽度达到831.81mm。同时本文对于该设计思路下的聚光系统进行了研究,得到CPC开口半角θ=45°较好,在工作时长6h内,照射在一次镜场中的光线进入CPC的比率均达到75%以上,瞬时进入率也高达75%以上,实验验证在夏天晴朗天气中午系统光学效率达到61%。

A linear Fresnel concentrating power-generation system is favored by the market because of its small windward area and high land-occupation rate.However,the further reduction of the construction cost of the concentrating system is an ongoing problem.Therefore,we include several thin heat pipes instead of a crude heat pipe to solve this problem so that the total opening and primary reflector widths are increased to 1118.79 and831.81 mm,respectively,for the compound parabolic condenser(CPC).Additionally,we study the light-gathering system for this design idea and find a CPC opening half-angle of 45°.For a working time of 6 h,the light that is incident on the primary mirror field is reflected into the CPC,and the rate is above 75%.Additionally,the instantaneous rate of light entry into the CPC is more than 75%.The experimental results showed that the optical efficiency reached 61% at noon in summer/sunny weather.